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Administration: Discovery
Configuring LLDP
NOTE
Configuring LLDP
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
VLAN configured on the switch. Refer to the
section for details.
CDP or LLDP does not distinguish if a port is in a LAG. If there are
NOTE
multiple ports in a LAG, CDP or LLDP transmit packets on each port without
taking into account the fact that the ports are in a LAG.
•
The operation of CDP or LLDP is independent of the STP status of an
interface.
•
If 802. 1 X port access control is enabled on an interface, the switch will
transmit and receive CDP or LLDP packets to and from the interface only if
the interface is authenticated and authorized.
•
If a port is the target of mirroring, then for CDP or LLDP it is considered
down.
CDP and LLDP are link layer protocols for directly connected CDP-capable or
LLDP-capable devices to advertise themselves and their capabilities. In
deployments where the CDP-capable (or LLDP-capable) devices are not directly
connected and are separated with CDP-incapable (or LLDP-incapable) devices,
the CDP-capable (or LLDP-capable) devices may be able to receive the
advertisement from other device(s) only if the CDP-incapable (or LLDP-incapable)
devices flood the CDP (or LLDP) packets they receive. If the CDP-incapable (or
LLDP-incapable) devices perform VLAN-aware flooding, then CDP-capable (or
LLDP-capable) devices can hear each other only if they are in the same VLAN. It
should be noted that a CDP-capable (or LLDP-capable) device may receive
advertisement from more than one device if the CDP-incapable (or LLDP-
incapable) devices flood the CDP (or LLDP) packets.
LLDP is a protocol that enables network managers to troubleshoot and enhance
network management in multi-vendor environments. LLDP standardizes methods
for network devices to advertise themselves to other systems, and to store
discovered information.
LLDP enables a device to advertise its identification, configuration, and
capabilities to neighboring devices that then store the data in a Management
Information Base (MIB). The network management system models the topology of
the network by querying these MIB databases.
LLDP is a link layer protocol. By default, the switch terminates and processes all
incoming LLDP packets as required by the protocol.
Configuring Voice VLAN
8
77
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